:root {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --err: #f87171;
}

* {
  box-sizing: border-box;
}

body.login-page {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei",
    sans-serif;
  background: radial-gradient(ellipse 120% 80% at 50% -20%, #1d4ed8 0%, var(--bg) 55%);
  color: var(--text);
}

.login-card {
  width: 100%;
  max-width: 380px;
  padding: 2rem 2rem 1.75rem;
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.45);
  border: 1px solid #334155;
}

.login-card h1 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
  font-weight: 600;
}

.sub {
  margin: 0 0 1.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.login-card label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.login-card input {
  width: 100%;
  margin-bottom: 1rem;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  border: 1px solid #475569;
  background: #0f172a;
  color: var(--text);
  font-size: 1rem;
}

.login-card input:focus {
  outline: 2px solid rgba(59, 130, 246, 0.45);
  outline-offset: 1px;
  border-color: var(--accent);
}

.err {
  color: var(--err);
  font-size: 0.85rem;
  margin: 0 0 0.75rem;
}

.submit {
  width: 100%;
  padding: 0.7rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
}

.submit:hover {
  background: var(--accent-hover);
}

.submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}